1. Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
2. Higher Technical Teachers Training College, University of Bamenda, Bambili, Cameroon
3. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
4. Department of Chemsitry, Faculty of Science, University of Dschang, Dschang, Cameroon
5. Department of Chemistry, Faculty of Science, University of Buea, Buea, Cameroon
6. Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
7. University Institute of Science, Technologies and Ethic, Yaoundé, Cameroun